QuickBooks Error 6000 comes when you’re trying to open QuickBooks desktop specifying that you are unable to open the company file.There are some causes that can be a reason for this issue.
Open the booklet that contains your company column.
Find the columns with the same column name as your company columns but with extensions. ND and..
Right- click each column and cherry-pick Rename..
Open QuickBooks again and try to autograph into your company column.